Genesis 22:6 God will provide HIMSELF a lamb for a burnt offering.

This prophecy is fulfilled at Christmas.

On that day God did provide a lamb caught in the thicket to take the place of Isaac which was only a shadow of the depth of the prophecy.  For the day came when God not only provided the lamb – He HIMSELF became that Lamb to take my place and to take your place.

Hebrews 10:5 Wherefore when he cometh into the world, he saith, Sacrifice and offering thou wouldest not, but a body hast thou prepared me.

The babe in the manger was that body – Emmanuel – God with us.